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我正在尝试将一个视频文件的多个片段复制到一个输出视频文件中，我只能使用以下代码为一个片段执行此操作：avconv -i input.flv -ss 00:04:50 -t 00:04： 00 -codec copy outputfile.flv 有没有办法用几个段来做？